However those hoping for a tell-all medical reveal may end up disappointed, according to Arthur Caplan, founding head of the Division of Medical Ethics at NYU School of Medicine.

“The president has the same right as any citizen in the United States to keep his medical information private,” he told The Sunday Telegraph. “There’s never been legislation requiring that he does otherwise.”

The examination is merely a custom that has become norm for presidents in recent years, rather than a constitutional or congressional requirement.

“Mr Trump has suffered no form of cancer, has never had a hip, knee or shoulder replacement or any other orthopedic surgery,” read a note from Harold N Bornstein, MD.

“If elected, Mr Trump, I can state unequivocally, will be the healthiest individual ever elected to the presidency.”

Reports of how the glowing assessment was procured – written in five minutes while a limo sent by Mr Trump waited outside, according to NBC News – dented its impact.

Dr Bornstein declined to comment on next week’s medical when contacted by this newspaper.

US history is littered with past presidents hiding illnesses. Grover Cleveland used the cover of a fishing trip to have secret cancer surgery on a yacht in 1893, fearing the impact on the markets if the news got out.

Franklin Roosevelt was said to have hidden the fact he was at “death’s door” when he sought re-election in November 1944. He won, but passed away within six months.

And it is only recently that the full scale of John F Kennedy's numerous medical problems, and the drugs he used to relieve the pain, have come to light.

The lack of legal requirement for presidents to publish medical examination results has led to calls for the custom to become a rule.

Barbara Perry, the director of Presidential Studies at the University of Virginia’s Miller Center, said: “Having come of age in the Watergate era, I am very keen on transparency in presidents."

She added: “Just as I want to know the pilot of my airplane is physically and mentally fit for service, the American people have the right to known the condition of their candidates and presidents.”

On Friday, Mr Trump will follow a long line of presidents into the examination room. Critics and supporters alike will be carefully watching the results.